Press



(No Model.) 2 shets -sheet '1;

M. SWENSON.

PRESS Patented Dec. 11,1894."

invemfin @W 5206x6020;

Hf HQ 11 UNITED STATES PATENT OFFICE.

MAGNUS SWENSON, or CHICAGO, ILLINOIS.

eases.-

EIIECIFIGATION forming part of Letters Patent No. 530,914, dated December '11, 1894. Application filed January 16, 1894. Serial No. 497,037. on model.)

To all whom it may concern.-

Be it known that I, MAGNUS SWENSON, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Presses; and I do declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon, which form a Io part of this specification. 7

This invention relates to improvements in presses and relates particularly to presses of the type adapted to extract the liquids from pulpy masses or substances.

Among the objects of the invention are, to provide a press adapted for use-in the process of rendering or trying out fats and to extract; the moisture from wet pulpy niassesor substances leaving a solid residue, which may be cc. burned as fuel, economically. Presses ofthis type are particularly adapted for use in packing houses, not only in the process of rendering or trying out the fats from the intestines and other refuse, but also to reduce the pulpy 2 5 contents of the paunch, and other waste pulpy substances to a condition in which they may be used as fuel, thereby rendering valuable .a hitherto valueless product, the disposition of which involved expense to the operator.

In its preferableform a press, embodying my invention, comprises a hollow cylinder, a hole or opening therein, through which the pulpy mass is admitted thereto; a hollow pointed piston or plunger fitted to said cylin- 5 der; means for reciprocating said piston or plunger longitudinally of said cylinder 5' and perforations formed in the discharge end of the cylinder and in the point of the plunger,

thereby constituting the same screens or strainers.

The invention also consists in the various other features, combinations of features and details of construction, hereinafter described and' then specifically pointed out in the ap- 5 pended claims. a

In the accompanying drawings, a press, em-

bodying my invention is fully illustrated.

Figure 1, is a plan view, the'plunger or piston being at the limit of its forward stroke. Fig. 2, is alongitudinalvertical section on the ing at the limit of its rearward stroke; ;3, is a transverse, sectional view on the line 3+3 of Fig. 1, the piston or plunger being at or near the limit of its forward stroke.

4., is a view of the front end of the piston or plunger; and Fig. 5, illustrates a modification of the press, showing the discharge end of the cylinderas contracted or choked.

Y In the drawingsthe cylinder of the press, :A, is secured to or formed integral with a suitable frame work or support, A.

that it will be stroke thereof and the lengthof said port is 75 A a portion of end thereof.

line 2-42 of Fig. 1, the plunger or piston be- Fig.

Both ends of the cylinder, A, are open and fitted thereto is a piston or plunger, A to which reciprocal movement, longitudinally of said cylinder, A, is'imparted by any suitable means.

The material or mass to be treated is preferably contained in a'hopper or receptacle, A

' whence it Is delivered to the press through an admission port or opening, a, In the cylinder, A. The port or opening, a, is so located relatively to the travel of the piston or plunger,

opened at each rearward about equal to one-half the length of the stroke of said piston or plunger. Thus at each rearward stroke of thepiston or plunger, the contents of the hopper, A descends into the cylinder, A, in front of said plunger and is forced along and through said cylinder by the forward movement of said plunger and discharged at the front open 'In the preferable construction also, the admission port or opening, 0,, ex-

tends somewhat more than one-half way around the cylinder, A, and the hopper, A is fitted to the edges thereof as clearly shown in Fig. 3. By this construction the delivery of the pulpy mass to the cylinder is greatly o facilitated.

The portion of the cylinder, A, through which the material to be pressed passes, that is, the part thereof in front of the opening, a, is perforated with holes, a, through which '9 5 the liquid contained in said mass drains, as themass is forced along said cylinder by the action of the plunger, A

Generally, the friction between the cylinder,

A, and the mass of material, as it is forced too liquid, extracted by the through the same by the piston or plunger, A offers sufficient resistance to the move ment of such mass to subjectthe same to the requisite pressure. In the preferable form of the press, also, the piston or plunger, A", is hollow and the front end thereof terminates in a point,'a. perforated with holes, a substantially in the same manner as the discharge end of the cylinder, A, is perforated. By this means a twofold advantage is secured, as follows: First, the pointed end of the plunger creates a pressure tending to force the contents of the cylinderoutward against the sides thereof and increasing the frictionbetween the same and the contents thereof and correspondingly increasing the pressure to which said mass is subjected; again, it is found,in practice, that the drainage through the perforations, 0., alone, does not suffice to sufiiciently dry the residue of solid material left in the cylinder, the middle of which mass still remains too wet to burn, economically, but when apiston, terminating in a perforated point is used, the liquid contained in the interior of the mass drains into the interior of the plunger, A at the rear end of whichit escapes.

In case it is desired to stillfurther increase the resistance offered to the passage of the solid residue through the cylinder, A, there by correspondingly increasing the pressure to which said residue is subjected, this can be efiected by slightly contracting or choking the discharge end of said cylinder, which can be easily accomplished by attachingto the end of having the desired contraction or choke, as clearly shown in Fig. 5.

Beneath the perforated portion of the cylinder, A, and the rear end of the plunger, A dripping pans are provided, into which the press, drains' and whence it escapes through suitable waste pipes provided for the purpose.

In the preferable form of the press, the perforated end of the cylinder, A, is inclosed in a jacket, A, which in addition to forming a dripping pan, renders it possible, by admitting steam thereto, to subject the contents of the cylinder to the action of a-high degree of heat. This is particularly desirable in the process of rendering or trying out fats. For the purpose of admitting steam to said jacket, an admission" pipe, a is 'pro'- vided, while the extracted fats and other liquids runoff through a dischargeor waste pipe, a which leads to any suitable tank or retort.

In order to prevent the contents of the hopper from working out at the rear endof said cylinder, a suitable packing gland may be provided for the plunger, at its rear end, as shown in Figs. 1 and 2 of the drawings.

Simple means for reciprocating the piston, A comprise a crank connected with said a connecting piston or plunger, by means of said cylinder, a removable section, A,

rod, cross-head and piston rod, a familiar construction very common in steam engines and the like. As the means for so reciprocating said plunger, form no part of the presentinvention, they have not been illustrated in the drawings.

As shown the rear end of the plunger, A is closed by means of a head, A to which the piston rod, A can be conveniently secured. When so closed, holes or openings, at, are' made in the under side of the said plunger adjacent to the rear end thereof, through which the liquid, which drains into said plunger, through the perforated point, a thereof may escape.

Eifective work may be done with a press of substantially the following proportions and dimensionsr-Oylindtar, three feet (3) long by four inches (4") in diameter; the admission opening being eight inches (8") long and extending one-half (:17) way around said cylinder and to within about eight inches (8") of the rear end thereof; plunger, two and onehalf feet (2%) long, having a stroke of sixteen inches (16) and so adjusted that the travel of the front end thereof will be forward from the rear edge of the admission port of the cylinder. 'l hesedimensions may be varied as desired to meet requirements.

I claim- 1. In a press, the combination with a cylinderprovided with an admission port or opening and perforated adjacent to its discharge end, ofa hollow piston or plunger fitted to said cylinder to which reciprocal movement is imparted whereby the admission port is intermittently opened, the front end of said piston 'or plunger terminating in a perforated point, substantially as described.

2. In a press,the combination with a cylinder provided with an admission port or openingand perforatedadjacent to its discharge end,of a hollow piston or plunger fitted tosaid cylinder, to which reciprocal movement is imparted, whereby the admission port is intermittently opened, the front end ofsaid piston terminating in a perforated point or cone, the base of which is smaller than the end of the piston or plunger, substantially as described.

3. In a press, the combination with a cylinder provided with'an ad mission port or open- ;ing and perforated adjacentto its discharge end, of a jacket inclosing the perforated section thereof, a hollow'piston fitted to said cyltinder, to which reciprocal movementlis imjparted, whereby the admission port is intermittently opened, the front end of saidpiston or plunger terminating-in a perforated point, isubstantially as described.

4:. In a press, the combination with a cylinder provided with an admission port or opening and perforated adjacent to itsdischarge end, of a jacket inclosing the perforatedportion thereof, a hollow piston or plunger fitted to said cylinder, to which reciprocal move- IIO , ment is imparted, whereby the admission my invention 1 hereunto set my hand this 10th 5 than the end of the piston or plunger, sub- Witnesses:

port is intermittently opened, the front end day of January,'1894.

' MAGNUS SWENSON;

of said piston or plunger terminating in a perforated point, the base of which is smaller stantially as described. J. H. GIBSON,

In testimony that I claim the foregoing as B. A. JOHNSTON; 

